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1、苏州河上游河岸缓冲带植被的研究(2)Level1IriparianstripsincludeZhaotun,Baihe,UpstreamDongfenggang,andHuajiangRoad,whichhavebasicallysteadycommunitystructureandcomparativelyaffluentspecies;and(3)LevelIIIripananstripsinclude从TandHuangdu,ofwhichtheformerpertainstonaturalstripswithrandoml
2、ygrowingruderalsduetolackofmaintenance,whilethelatterisa“GreenCorrider"wimcomparativelylowamountsofvegetationspeciesandrlarrowstripbandwidth.However,№providesadviceonselectionoflocalspeciesandvegetationpatternsandHuangdu,theonlyartificialsamplingpointwithabundantgrass
3、coveringland,suggestsreasonableconununitystructureforthereference.Besides,ThesisanalyzedanddelineatedthelandusetypesintheupstreamregionsofSuzhouCreekintermsoftheInvestigationandaerialphotographs,andevaluatedthegrasslandresearchandvegetationpatternexperimentsundertaken
4、intheexperimentalareaatDongfenggang.Accordingtoresearchfindings,Thesisfinallyputforwardsuggestionsapplicableforestablishingandrestoringriparianbufferstrips,includingthespeciesselection,collocation,thebandwidthdeterminationaswellasthemaintenanceandmanagementfortheripar
5、ianbufferstrips.Altogetherwithfirst-handdataandresultsobtainedintheInvestigation,andthefruitsandexperiencesummarizedinDongfenggangexperiments,ThesisraisedthecomprehensiveproposalandpossibleplanningforbuildingvegetationalongthesuburbanriverbanksofupstreamregiORSofSuzho
6、uCreek,suchastheadviceonintroducingarbor,shrub,grassandhyarophytetoformcomplicatedcommunitystructuresandtherequirementsonjudgingandchoosingappropriateplantspecies,specificallydiscussedthedesignprinciplesandspeciesselectionforthreedistinctivetypesof印arianstrips,namelyn
7、aturalriparianbufferstripsclosetofarmland,man-maderiparianbufferstripsclosetoroads,andman-maderiparianbufferstirpsforlandscapeusage.Keywords:SuzhouCreek,upstreamregions,却adanbufferstrips,vegetationpattern,indexsystem.6.苏州河上游河岸缓冲带植被的研究1前言1.1研究背景和意义1.1.1研究背景近一个世纪以来,随着人口
8、的激增和工农业生产的发展,河流生态系统,特别是河岸带生态系统由于受人类活动的干扰而严重退化。全球20%以上的河岸带植被已不复存在,剩余部分也在迅速消失。退化河岸带往往造成植被破坏、生物多样性下降、小气候恶化、河床及河岸遭受侵蚀、洪涝灾害频繁,严重威